Parameters

Description

These routines generate a read of various sizes from memory space or
allocated DMA memory. The ddi_mem_get8(), ddi_mem_get16(), ddi_mem_get32(), and ddi_mem_get64() functions read 8
bits, 16 bits, 32 bits and 64 bits of data, respectively, from the
device address, dev_addr, in memory space.

Each individual datum will automatically be translated to maintain a consistent view
between the host and the device based on the encoded information in
the data access handle. The translation may involve byte-swapping if the host
and the device have incompatible endian characteristics.

Context

These functions can be called from user, kernel, or interrupt context.